Rear slick size for 66 Belvedere

[383 a4 runner]

So any thoughts on a 9x28 slick on a15x7 with a 3 3/4” backspace?

9x28 is fine but go with 15x8,4 1/2” bs

 

[66Satellite47]

Which brand and bias or radial? Both of these make a difference.

 

[Big bill]

Bias phoenix fx I’m thinking on 15x7 steel wheel from the 80s diplomat .

 

[Jeff_383]

9x28 is fine but go with 15x8,4 1/2” bs

3 3/4 no

 

[Jeff_383]

Bias phoenix fx I’m thinking on 15x7 steel wheel from the 80s diplomat .

Yes

 

[33 IMP]

Bias phoenix fx I’m thinking on 15x7 steel wheel from the 80s diplomat .

That should work. If it's too close to the spring, a small spacer can fix that.
You do have long studs on the back, right?

 

[66Satellite47]

The Phoenix tires are the Firestones from the '70 -80's. I preferred the 'Stones to the Goodyears or M&H back in the day. The 'Stones were lighter and did very well with my setup. For several seasons I ran my 11.5X29.5W on a 10" wheel not the recommended 12". It worked fine although slightly more wear in the center than with the 12" wheel. My point is although a 8" wheel is recommended for a 9X28 tire, I bet a 7' will work just fine. I also used 1/4" spacers for about a thousand runs with no problem. Just say'n.

 

[actionange1]

15x8 with 4.5 backspace
9x28 tires

 

[theman440]

An 8 inch rim really needs 5 inch bs to work right

This is correct -

 

[theman440]

On my '66 Coronet I had 30x9 radial Hoosiers with a 8in wheel,4.5 backspace. Still had to trim the outer wheel housing lip and beat in the outer wheel house. 5 inch BS wheel would be better. I also had to space the front hangar back 1/4 inch.

 

[actionange1]

This is correct -

But I raced the car in the above post for 11 years with 8 inch 4.5 backspace
It went 9.88@135 best. Race weight with driver was 3750
I think the 4.5 backspace worked ok

 

[theman440]

But I raced the car in the above post for 11 years with 8 inch 4.5 backspace
It went 9.88@135 best. Race weight with driver was 3750
I think the 4.5 backspace worked ok

Yes, 4.5 bs does work, as it worked for me. But in my case a 5in backspace would have been better.

 

[TrackPack]

Yes, 4.5 bs does work, as it worked for me. But in my case a 5in backspace would have been better.

This^^^^^^^^^^^^.

It's better to have the tire closer to the spring than the outer wheelhouse lip. The tire to spring clearance is basically a fixed measurement, while the body to tire clearance will vary quite a bit while driving.

 

[mmissile]

9X30- Goodyear [stiff sidewall], on 15X7 Cragar S/S. Front corner was moved an inch forward, lip was rolled, and a 2lb. hammer in a couple of places on the inside of the tub. It was very tight, but I drove it on the street.

 

[Big bill]

9X30- Goodyear [stiff sidewall], on 15X7 Cragar S/S. Front corner was moved an inch forward, lip was rolled, and a 2lb. hammer in a couple of places on the inside of the tub. It was very tight, but I drove it on the street.

View attachment 1270271 View attachment 1270273 View attachment 1270274

Very nice car !!

 

[66Satellite47]

15x8 with 4.5 backspace
9x28 tiresView attachment 1269760

Appears like you have some serious power there.

 

[actionange1]

Appears like you have some serious power there.

It was plenty powerful. Fun to drive. Working on an A body now.